bn

An agent-friendly CLI for the Binary Ninja database already open in your GUI. Read decompilation, assembly, references, and types; run unrestricted in-process Python; apply mutations with preview and live verification. The GUI companion works with a personal license and requires no headless license.

Install

uv tool install bn-cli
bn plugin install
bn skill install

The last two commands link the packaged plugin into Binary Ninja and the skill into $CODEX_HOME/skills (default ~/.codex/skills). Use --mode copy for standalone copies. Restart Binary Ninja after installing or upgrading the plugin; restart Codex to discover a newly installed skill.

Upgrade with uv tool upgrade bn-cli. Reload Python plugins or restart Binary Ninja after code changes: Restart Bridge alone restarts the socket with the already-loaded Python code.

Start with a target

bn target list
bn decompile player_update --target crimsonland.exe.bndb

With exactly one open view, omit --target. With several, use the returned selector; omission fails instead of silently choosing a GUI tab. --target works anywhere in the command, and BN_TARGET sets a shell default. Use --target active only to deliberately follow the selected GUI tab.

Common reads

bn function search player
bn function search --regex 'attach|detach'
bn function info player_update
bn function info player_update --locals
bn decompile player_update
bn il player_update --view mlil --ssa
bn disasm player_update
bn disasm 0x401234 --count 20
bn disasm 0x401234 --end 0x401280
bn xrefs player_update
bn refs player_update
bn callsites crt_rand --within bonus_pick_random_type
bn address info global_player+0x308
bn data read global_player+0x308 --type u32 --count 4
bn struct show Player
bn types show Player
bn search text crt_rand --view hlil --max-results 50

Function reads accept a name or an address inside a function. Address reads also accept symbols and symbol+offset. Function lists/searches support --min-address and --max-address.

function info returns a compact summary; --locals or local list expands variables with stable IDs. xrefs finds inbound references; refs finds outbound references. callsites recovers native call addresses and exact post-call return addresses, with optional local HLIL/branch context. See the callsite reference for scoped and caller-static workflows.

Linear disasm --count/--end works without function analysis; --end is exclusive. Results report unmapped or undecodable stopping points. For analyzed-function windows, use --before-instructions/--after-instructions. Legacy --before/--after still select instruction windows without --match; with --match, they consistently mean text-line context.

Whole-database search text and search constant have a five-second default analysis budget and report incomplete results. Increase their --timeout explicitly when needed; function search does not take that option.

For the full command surface, use bn --help. Use scoped help or machine-readable discovery for details:

bn disasm --help
bn schema disasm
bn schema function info

Schema output defines common arguments once and references them from each command, with per-command defaults. It requires no live bridge.

Output and bundles

Read commands default to text; mutations, setup, and bundles default to JSON.

Text above 40,000 bytes spills to a unique file, leaving a short preview on stdout and metadata on stderr. Explicit structured spills return an envelope on stdout. Artifact metadata includes path, format, bytes, SHA-256, and a summary. Normal output needs no tokenizer; install the bn-cli[tokens] extra for exact artifact counts. Unavailable tokenization produces a warning without losing the artifact.

bn decompile player_update --match 'health|damage' --before 2 --after 3
bn bundle function player_update projectile_update --include decompile,disasm --out /tmp/functions.json

Bundles default to decompile, disassembly, and outbound references. Select decompile,mlil,llil,disasm,locals,comments,xrefs,refs, or all for full export. HLIL appears only once. Multiple identifiers are deduplicated; per-function errors preserve successful reads and produce a nonzero exit status.

Python

bn py runs Python with unrestricted bn/binaryninja and bv/current_view access. bn py exec remains an alias. Use --code for one-liners, --script for saved files, or pipe multiline code with a quoted heredoc:

bn py <<'PY'
f = function("player_update")
result = {"address": hex(f.start), "instructions": sum(1 for _ in f.hlil.instructions)}
PY

Helpers include address, function, functions_containing, typed read_u*/read_i*, read_ptr, read_f32, read_f64, and read_cstr. BN iterators may need materialization. Both stdout and result are returned; non-JSON results use repr with a warning. Syntax errors are caught locally; runtime errors retain the in-process traceback. Raw Python writes do not inherit built-in mutation rollback or verification.

Mutations

bn symbol rename sub_401000 player_update --preview
bn proto set player_update 'void player_update(Player* self)' --preview
bn struct field set Player 0x308 movement_flag_selector uint32_t --preview
bn types declare --file /path/to/types.h --preview

Preview applies, refreshes, verifies, captures diffs, then reverts. Omit --preview to commit a verified change. Failures roll back; results distinguish verified, noop, unsupported, and verification_failed, with requested/observed state where relevant. Use IDs from local list for local edits. Type imports preserve the source path for relative includes; declarations with no named types to persist report a no-op.

Read back the relevant prototype/type and decompile after changes. types show and struct show are authoritative when HLIL still displays stale __offset(...) expressions. bn refresh refreshes analysis but may not eliminate every presentation artifact.

Troubleshooting and development

bn doctor checks discovery, capabilities, installed code, and stale loaded plugin versions. If no targets appear, open a database and check that the companion is loaded. A socket Operation not permitted under Codex indicates sandbox access; run the authorized bn command outside that sandbox. Avoid reinstalling the plugin to fix a permission denial.

uv sync --locked
uv run pytest
uv run bn --help
uv run python scripts/release.py --check
uv build

For editable development, use uv tool install -e .. To prepare a release, run uv run python scripts/release.py <version>, update CHANGELOG.md, commit, and push the matching v<version> tag. CI tests Python 3.12/3.14, verifies the wheel, publishes to PyPI, and creates the GitHub release. The CLI and companion must use the same protocol version; restart/reload the companion after upgrades.